I'm using cardview on listview. And cardView has a icon.I wanna change icon color. When i click icon ,color is changed very well but whole listView is reloaded and goes to top of the listView. How can i change icon color withot refreshing listView?
connect the color to a variable and on an event change the variable using an terinary function then setState on the stateful widget.
Widgets vs helper method.
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Here you can make a separate widget. That should be a stateful class. Otherwise, you can use any state management.
Related
https://docs.flutter.dev/development/ui/interactive
A stateless widget never changes. Icon, IconButton, and Text are examples of stateless widgets. Stateless widgets subclass StatelessWidget.
https://api.flutter.dev/flutter/material/IconButton-class.html
An icon button is a picture printed on a Material widget that reacts to touches by filling with color (ink).
Icon buttons are commonly used in the AppBar.actions field, but they can be used in many other places as well.
If the onPressed callback is null, then the button will be disabled and will not react to touch.
When this button reacts to user touches, that means it is interactive? Then why does it fall under Stateless category?
The icon button is reactive, it reacts to touches. But can not change its state.
Stateless means the Widget can not recompose but it does can react to userevents like tapping. Look Textfield it has the ability to recompose it self whenever the text changed, So it means it is changing its UI state which is called a 'Stateful Widget'.
I hope you understood Cheers!
I want to show my own page on dropdown button tap, then item selected on page should be set as dropdown button value.
So basically, I need DropdownButton without any popup on tap. When I use onTap still default popup will be shown, how to prevent that?
why you don't use a button instead? or you can try to create an Inkwell put a container on its child and make it look like a button and write your code inside Inkwell OnTap(){}
1- Pass null to items parameter to disable the button.
2- You'll notice icon's color will be grey with disabled button, you can change it by setting color of the icon you send to icon parameter or send color directly to iconDisabledColor parameter.
3- You'll not use value parameter, instead you'll just use hint to show both your hint and your value. and update it using your state management after you pick new value from your own page.
4- Wrap your DropdownButton with GestureDetector or InkWell to show your own page when you tap on the button.
5- If you want to customize your DropdownButton shape, size and more. You can try my new package DropdownButton2. It's simple, easy, based on Flutter's core DropdownButton and have lots of features.
I am currently trying to create something like a TabBar. I created a horizontal ListView which should work as the TabBar and I my goal is, that one row fills itself with a list that contains the cards for the Tab I clicked on and refreshes when I click on another one. Is there a way to do that? It should look like this:
Reference Picture
Did you look at Work with tabs, an introduction to TabBar, TabBarView and DefaultTabController?
You could also create it from scratch using a ListView with a Card wrapped in a GestureDetector or a ListTile, and detect taps on onTap, which would set the selected data and update state using setState.
I started with the default Statfull Widget HomePage and a FAB.
The main widget in the page is a ListBuilder that is updated from a stream using Provider.
When an item on the list is clicked, I need to change the icon on the FAB.
All this works fine.
Now I wonder, If I would like to change the home page as a StatelessWidget. So I don't need to build the entire page just to change the icon on the FAB.
How can I update the Icon if I don't have setState() to rebuild the page?
the best answer should be use some sort of state management, but here's a quick and easy way to achieve your goal
create a function in your parent widget
Function callback(){
setState((){
//change Icon
});
}
Then pass it on to your stateless widget
CustomFabWidget(callback)
I am making an app whose structure is very simple.
A ListView with Listtiles in it.
I want to add animation such that when the screen is opened the listtiles slide in.
Flutter provides a AnimatedList Widget.
Perhaps this native widget will give you the desired output